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Mammals reproduce with their eggs and sperm. The females carry the eggs, and the males carry the sperm. The sperm fertilizes the egg, and wallah, life is made.
http://answers.ask.com/Science/Biology/how_do_mamm...
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It's an inborn urge. Any species that lost it would eventually die out.
http://wiki.answers.com/Q/Why_do_mammals_reproduce
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Most mammals give live birth, except for the platypus and echidna. They lay eggs, and are called monotremes.
http://wiki.answers.com/Q/How_do_mammals_reproduce...
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The answer to how placental reproduce is sexually. Placental mammals are developed inside the body of the mothers.
http://wiki.answers.com/Q/How_do_placental_mammals...
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